2 Answers
2

There's no need to change every BibliographyDriver -- the solution is similar to this one: load biblatex with the options citestyle=numeric,bibstyle=authoryear and add the \defbibenvironment definion of numeric.bbx. (The xpatch package is only used to remove the parentheses around the year.)

Works like a charm. Now I also learned how to remove parentheses from the year in the bibliography. I tested this, and it works with other styles too, such as style=authoryear.
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SverreJan 25 '13 at 19:55

For somethings you can just set an option/toggle to change the formatting. There is a nice explanation in this question. Moving the date is not that simple. There currently is not a WYSIWYG editor for biblatex styles or even a system like makebst so your best bet is to find an existing style that meets your needs (or change your needs). If you really want to do it, you could redefine a bunch of macros in the preamble, but it will be much easier to create your own style.

Starting from standard.bbx you would need to redefine all the bibmacros which have "date" in their name like

Wow, that entails a lot more stuff in the preamble than I had hoped for! Furthermore, I realized there is more stuff to sort out. For instance, some bibmacros have more than one \usebibmacro{date} fields. Then what? Delete all? Also, many of the BibliographyDrivers make reference to fields such as \usebibmacro{location+date}. But these don't exist anymore, since I've removed the date part.
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SverreJan 25 '13 at 18:00

@Sverre I said it wasn't trivial. I definitely would define a new style (or better yet find a existing style that meets your requirements). As for the +date part, yes you need to modify everything.
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StrongBadJan 25 '13 at 18:07